Melilite-Type Borates Bi<sub>2</sub>ZnB<sub>2</sub>O<sub>7</sub> and CaBiGaB<sub>2</sub>O<sub>7</sub>
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
The bismuth borates Bi 2 ZnB 2 O 7 and CaBiGaB 2 O 7 have been synthesized by solid-state reactions at temperatures in the 650−825 °C range at 1 atm pressure. These compounds are the only synthetic diborate members of the melilite family, A 2 XZ 2 O 7, in which layers of A cations alternate with XZ 2 O 7 tetrahedral layers. Except for CdBiGaB 2 O 7, the synthesis of other substituted bismuth borate melilites has been unsuccessful. The crystal structures of Bi 2 ZnB 2 O 7 and CaBiGaB 2 O 7 have been determined by powder X-ray diffraction and refined by the Rietveld method using powder neutron diffraction data. CaBiGaB 2 O 7 adopts the regular tetragonal melilite structure ( P 4̄2 1 m space group, Z = 2) containing B 2 O 7 tetrahedral dimers. The refinement of split eight-coordinated sites for the Ca 2+ and Bi 3+ interlayer cations suggests the presence of additional disorder. Bi 2 ZnB 2 O 7 adopts a unique orthorhombic melilite superstructure ( Pba 2 space group, Z = 4) containing both tetrahedral B 2 O 7 and triangular B 2 O 5 dimers. The Bi 3+ cations occupy two distinct interlayer sites with strongly asymmetric 6-fold coordination environments. The preliminary measurement of second harmonic generation efficiencies ( d eff ) of powder samples has yielded values of 4.0 (Bi 2 ZnB 2 O 7 ) and 1.6 (CaBiGaB 2 O 7 ) relative to a KH 2 PO 4 standard.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.004 | 0.002 |
| Meta-epidemiology (narrow) | 0.004 | 0.004 |
| Meta-epidemiology (broad) | 0.005 | 0.001 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.002 | 0.003 |
| Scholarly communication | 0.003 | 0.002 |
| Open science | 0.003 | 0.003 |
| Research integrity | 0.003 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it